Sonia Brand Aluminum Hood.
Cylindrical tube type hood. Ideal for mirror and telephoto lenses. This hood is 73mm / 3" long, and weighs 3.5oz (9.9 gm) and is intended only for longer lenses 200mm, 300mm, 400mm, 500mm, 600mm etc (it may cause vignetting with shorter lenses). Extremely solid and sturdy. It has both 77mm male and female threads.

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